US5710957A - Reproduction apparatus transmissivity sensor system for duplex documents - Google Patents
Reproduction apparatus transmissivity sensor system for duplex documents Download PDFInfo
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- US5710957A US5710957A US08/751,893 US75189396A US5710957A US 5710957 A US5710957 A US 5710957A US 75189396 A US75189396 A US 75189396A US 5710957 A US5710957 A US 5710957A
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- document sheet
- transmissivity
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- imaging
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- 230000008901 benefit Effects 0.000 description 3
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Images
Classifications
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/50—Machine control of apparatus for electrographic processes using a charge pattern, e.g. regulating differents parts of the machine, multimode copiers, microprocessor control
- G03G15/5025—Machine control of apparatus for electrographic processes using a charge pattern, e.g. regulating differents parts of the machine, multimode copiers, microprocessor control by measuring the original characteristics, e.g. contrast, density
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/22—Apparatus for electrographic processes using a charge pattern involving the combination of more than one step according to groups G03G13/02 - G03G13/20
- G03G15/23—Apparatus for electrographic processes using a charge pattern involving the combination of more than one step according to groups G03G13/02 - G03G13/20 specially adapted for copying both sides of an original or for copying on both sides of a recording or image-receiving material
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/00795—Reading arrangements
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G2215/00—Apparatus for electrophotographic processes
- G03G2215/00172—Apparatus for electrophotographic processes relative to the original handling
- G03G2215/00324—Document property detectors
Definitions
- a document reproduction apparatus for optically or digitally imaging physical document sheets being fed to an imaging station, wherein the scanning movement of a simple and compact linear motion transmissivity sensor scanning in only one axis, orthogonal the document sheet motion direction, is coordinated with the timing and movement velocity of the document sheet past that sensor movement axis so as to transversely scan the document on two axes before the document is imaged, desirably scanning the document from one corner to an opposite corner to scan all four edge margins, to provide a transmissivity measurement of the document sheet substrate which is less error prone and more accurate than a single axis transmissivity scan, and does not require a delay in the actual imaging.
- both optical light lens copiers and digital document scanning systems have difficulties in obtaining clean images from original images printed on thin or otherwise partially translucent original documents, that is, non-opaque documents with relatively high light transmissivity, such as 13# weight or lighter paper, Japanese "rice paper", newsprint, etc.
- This is a particular problem with duplex documents i.e., documents having printed text or other images on the back side of the document in addition to the front side image being copied or imaged, as is typical of newspapers, and is more common in general as environmental concerns induce more duplex printing and copying.
- the duplex document back side image can "show through”, as it is called, the translucent sheet to be picked up or seen by the imaging system as an interfering or "ghost” image superimposed on the correct, front side, image.
- the imaging system can still have serious "show through” problems if they are translucent or light transmissivity image substrates.
- Contaminants or marks on the backing surface(s) behind the document in the image area can "show through” the document and be inadvertently imaged. That can be document feed belt edge shadows, or imaging stations with automatic or semi-automatic document feeders.
- Such document feeder belts or rollers even if originally white, tend to develop dark areas in use unless cleaned regularly, and where they overlay the imaging area, these dark areas can be inadvertently imaged through the translucent document. "Show-through" defects on the image and/or an ultimate copy print therefrom can even be present in an imaging system in which the document is manually placed on an imaging platen and scanned while held stationary under a stationary cover, where there are dark marks or contaminants on the platen cover or other backing surface, or, as discussed, duplex documents.
- Various document imaging stations and document feeding systems therefor are well known and need not be described herein.
- Xerox Corp U.S. Pat. No. 5,488,464 issued Jan. 30, 1996, and other document imaging patents are cited therein.
- imaging adjustments are known to have other potential disadvantages, such as affecting the quality of the desired front side image in some cases, or causing "show-around” or inadequate document edge shadow “fade-out", or even loss of lighter portions of the desired front side image if the imaging threshold level is reduced below that image level.
- imaging adjustments it is undesirable to use such imaging adjustments unless they are needed, and only to the extent necessary.
- the system disclosed in the embodiment herein provides improvements in that and other respects.
- a transmissivity sensor which only scans a document on one axis can be "fooled” by seeing lines, lines of dark print, or other opaque image areas running in that same axis, instead of measuring the transmissivity of the paper or other substrate itself in unprinted areas thereof, between such lines, or in the unprinted margin areas typically found near at least one of the four edges of the substrate sheet.
- an advantage of the simple system illustrated herein is that it provides scanning of the document transmissivity of the document both lengthwise and edgewise, across both axes, yet does not require a large expensive array of multiple sensors nor a large or complex mechanism which must sweep over a large area to accomplish that objective.
- a specific feature of the embodiments disclosed herein is to provide a document reproduction apparatus with an imaging station and a sheet feeding system for feeding physical document sheets in a document sheet feeding path at a first velocity in a document sheet motion direction to said imaging station to be imaged and then fed away from said imaging station, said document reproduction apparatus also having a transmissivity sensor for measuring the transmissivity of the document sheets to be imaged to provide an imaging control signal for reducing show-through imaging defects from light transmissive document sheets including show-through imaging of opposite side images on light transmissive document sheets; the improvement comprising a linearly movable document sheet light transmissivity measurement system mounted across said document sheet feeding path outside of said imaging station, a scanning system for linearly moving said document sheet light transmissivity measurement system on a single axis of movement at a second velocity across said document sheet feeding path transversely of said document sheet motion direction, said scanning system being controlled to move said document sheet light transmissivity measurement system transversely across a document sheet moving in said document sheet feeding path in coordination with said document sheet movement past said document sheet
- said scanning system is controlled to move said document sheet light transmissivity measurement system with a velocity ratio of said second velocity to said first velocity of the document sheets proportional to the ratio of the dimensions of the orthogonal sides of the document sheet being scanned; and/or wherein said scanning system is controlled to scan said document sheet light transmissivity measurement system diagonally across a document sheet from one corner of the document sheet to an opposite corner of the document sheet; and/or wherein said document sheet light transmissivity measurement system is mounted upstream of said imaging station and moves orthogonally to the direction of movement of the document sheet to diagonally scan the document sheet on two axes before the document is imaged; and/or wherein said document sheet light transmissivity measurement system comprises an unobstructed vertical light beam projecting perpendicularly through the document sheet being scanned.
- Another specific feature of the embodiments disclosed herein is to provide a method of imaging a non-opaque duplex document sheet with images on both the first and second sides thereof being imaged at an imaging station by improving the reproduction of the images on one side of the document sheet by reducing the imaged show-through of the second side image through the non-opaque document sheet in the first side image, wherein the document sheet has at least one edge margin area which does not have an image in that edge margin area, comprising: scanning across the non-opaque document sheet outside of said imaging station in a two axes scanning path with a transmissivity sensing system having a light beam passing through said document sheet, said scanning path passing through said edge margin area of said document sheet which is not imaged, so as to detect the transmissivity of said document sheet unobstructed by said image; and generating an image processing control signal from said transmissivity sensing system proportional to said transmissivity of said document sheet unobstructed by said image for reducing said imaged show-through of said second side image.
- the controller programming software may of course vary depending on the particular functions, software type, and microprocessor or other computer system utilized, but will be available to, or readily programmable without undue experimentation from, prior reproduction apparatus products and literature, functional descriptions, such as those provided herein, and/or prior knowledge of functions which are conventional, together with general knowledge in the software and computer arts.
- the disclosed control system or method may be implemented partially or fully in hardware, using standard logic circuits or single chip VLSI designs.
- the resultant controller signals may conventionally actuate various conventional electrical components, such as well know and/or commercially available power supplies and switches, paper path drives and gates, etc., as is well known in the art.
- the machine control functions may all be centralized in a single motherboard area, or partially distributed in interconnecting daughterboards or chips in different modules or areas.
- the machine controller can be loaded with different sets of imaging control or manipulation software appropriate for the different sensed document transmissivities.
- FIG. 1 is a schematic top view of one embodiment of the disclosed transmissivity scanning system in one example of an otherwise conventional document feeding and imaging apparatus, such as in the example of FIG. 2, which is partially removed here for drawing clarity;
- FIG. 2 is a schematic side view of the exemplary embodiment of FIG. 1, also schematically showing a overlying document tray automatic document feeding source merely as one example thereof;
- FIG. 3 is an enlarged side view of the exemplary scanner drive system of the transmissivity scanning system of FIGS. 1 and 2;
- FIG. 4 is one example of a flow chart or schematic circuit for the embodiment of FIGS. 1-3.
- FIGS. 1 and 2 there is partially shown in FIGS. 1 and 2 one example of an otherwise conventional image reproduction apparatus or imaging system 10 for imaging documents, having various of the subject and other features, merely by way of one example of the application of and combination with the subject exemplary document substrate transmissivity sensing system.
- the imaging system 10 has an otherwise conventional document feeding or paper path 12 and its drives, conventionally controlled by a controller 100, and other conventional components.
- the document sheets 14 are conventionally sequentially fed thereby to a conventional imaging station 18 in the machine 10 to be imaged, by conventionally feeding the documents onto a transparent imaging platen 18a.
- a transparent imaging platen 18a For illustrative purposes in the exposed top view of FIG.
- both the document 14a being, or about to be imaged and the immediately prior imaged document 14b ejected into an exit tray are shown with a rectangular phantom dashed outline here slightly inside the document 14 edges, to illustrate typical text margins, that is, to illustrate the typical extent of the text area on the documents 14, indicated here by side, top and bottom edge margins 14a, 14b, 14c and 14d, one or more of which document edge margins are typically outside of the printed text area of a document and thus unprinted.
- the documents 14 are scanned for transmissivity by being fed through a scanning system 20 having a simple IR or light beam document transmissivity scanner or sensor 22 linearly moved by a reciprocal scanning drive system 24 transversely of the documents 14 being fed into the imaging station 18.
- the scanning system 20 could be a modular optional add-on unit, since it requires little additional space, especially if located as shown, just upstream of the imaging station 18 in the document feeding in path 12.
- the linear transverse movement V2 of the scanning system 20 here is started and coordinated with the orthogonal velocity of the document 14 passing downstream therethrough, shown by the movement arrow V1 in FIG. 1, to desirably cause each document 14 to be scanned transversely, from one corner to the opposite corner of the document, as shown by the respective diagonal dashed phantom scan lines 25a and 25b on the documents 14a and 14b in FIG. 1 here.
- a difference in scanning direction is shown by the opposing angles of the diagonal dashed phantom scan lines 25a versus 25b shown in sequential documents 14a and 14b.
- the document scanning here is also bi-directional, that is, the scanning staffs from the top of one document and goes in one direction, and then staffs from the bottom of the next document and goes in the opposite direction, as shown by the respective solid and dashed-line movement arrows associated with scanner 22 in FIG. 1, and its illustrated solid and phantom line positions.
- This avoids having to delay document feeding to return the scanner 22 back to one side of the document path.
- this causes alternate documents are scanned on opposite diagonals, in both cases a diagonal, two axes, scan is provided which encompasses all four possible edge margins 14a,14b,14c and 14dof the sheet.
- the system 20 here scans the full X and Y dimensions of each document sheet 14, while the document is moving in its X direction, as shown in FIG. 1. That is, by passing from one of two diagonally opposing sheet corners to the opposing sheet corner of each document, the scanning line 25a or 25b also passes through a portion of all the edge margins 14a,14b,14cand 14dof each document 14, and thus the scanning line is highly likely to pass over at least one unprinted edge margin area of the document 14. Thus, this scanning path 25a or 25b is highly likely to pass over an unprinted area of the document and thus produce an output signal for controller 100 corresponding to the highest light beam transmissivity (highest translucency, least opaque) reading of the transmissivity sensor 22 for the document 14.
- That reading or signal should thus be the transmissivity of the document substrate per se, which is the control signal desired to adjust the system to reduce or prevent undesired imaging "show through” problems from opposite side images or otherwise as described above.
- the control signal desired to adjust the system to reduce or prevent undesired imaging "show through” problems from opposite side images or otherwise as described above.
- the desired two axes sensor 22 scanning path 25a or 25b will reach both corners of the document and thus all 4 edge margin areas of the document. That can be accomplished by setting the scanner initial or staff of scan position to align with the known position of the lateral edge of the document as the document enters the scanner, i.e., to the document 14 Y axis position, as shown in FIG.
- the controller 100 can conventionally or otherwise know in advance the ratio of X/Y, from those dimensions of the document 14. Since the system can thereby know the ratio of X to Y, it can, as shown above, establish the velocity ratio of V1 to V2, as the ratio of X to Y. To achieve that desired velocity ratio, the system can fix V1 and vary V2, or fix V2 and vary V1.
- control system 100 causes the scanner drive system to moves the document sheet light transmissivity measurement system orthogonal of the document sheet to be scanned with a velocity ratio of its own velocity V2 to the velocity V1 of the document sheet in the document feeding path which is proportional to the ratio of the dimensions of the orthogonal sides X and Y respectively of the document sheet being scanned.
- the senor can scan diagonally across the entire document on both axes from one corner to an opposite corner of the document and thereby scan into all four of the possible unprinted edge margins of the document to obtain a more reliable imaging control signal therefrom.
- the dimensions of a document in a document feeding system can be determined in different known ways, or combinations thereof.
- One known way is from the document feeder tray side guide settings, as noted in Xerox Corp. U.S. Pat. No. 5,511,771 issued Apr. 30, 1996 to R. F. Rubscha, and other patents cited in Column 6 thereof, or the like.
- Other known document path sensor systems detect document dimensions by the timing between the passage of their lead and trail edges.
- Various of these and other known document size systems can also employ look-up software tables of known standard document sizes, since standard size documents have known length to width or X/Y ratios, and it can normally be assumed that the documents will be only, or almost always, of certain standard sizes in any one country.
- the sensing system 20 linear drive system 24 for the sensor 22 can be any of many different simple mechanical and/or electrical systems. As shown enlarged in the side view of FIG. 3, a simple motor drive of spaced pulleys 27 and 28 on opposite sides of the document path moving cables above and below the document path 12 can simultaneously pull an IR or light beam generator and its light beam receiver as a paired unit respectively above or below the document path, transversely thereof, to define a sensor 22 by which the amount of light passing through a document can be continuously measured as the sensor 22 moves, as discussed above. Conventionally, the maximum transmissivity base line output level for the sensor 22 can be measured with no document present therebetween.
- a gray or black (opaque) transmissivity test patch window or sensor beam block can be provided at a park position of the scanning drive system 24 at one end of the scan movement path of the sensor 22 in order to provide a low transmissivity base line signal.
- the present off-platen document opacity sensing system as opposed to an on-platen document sensing system, is that the measured transmissivity is not affected by reflections or contamination from the sensor light beam having to pass through a glass platen. Also, normally there is a required platen cover and/or a document handler with a document platen transport overlying the document and the platen. That would not allow a simple, direct and perpendicular to the document light beam transmissivity system as here.
- the sensor 22 light beam can look up or down completely unobstructedly through an open slot, such as slot 29 seen in FIG. 1, in the document sheet transport baffles, so that only the document sheet itself is ever in the sensor light beam.
- the sensing system 20 is shown here upstream of the imaging station 18, which is normally preferred.
- the transmissivity testing of the documents could instead be done downstream of the imaging station after the documents are imaged.
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Abstract
Description
Claims (11)
Priority Applications (1)
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US08/751,893 US5710957A (en) | 1996-11-18 | 1996-11-18 | Reproduction apparatus transmissivity sensor system for duplex documents |
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US08/751,893 US5710957A (en) | 1996-11-18 | 1996-11-18 | Reproduction apparatus transmissivity sensor system for duplex documents |
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US5710957A true US5710957A (en) | 1998-01-20 |
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US08/751,893 Expired - Fee Related US5710957A (en) | 1996-11-18 | 1996-11-18 | Reproduction apparatus transmissivity sensor system for duplex documents |
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Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6337958B1 (en) | 2000-09-05 | 2002-01-08 | International Business Machines Corporation | Matching the printing characteristics between two engines of a duplex print system |
US20060088208A1 (en) * | 1998-06-23 | 2006-04-27 | Sharp Kabushiki Kaisha | Image processing apparatus, image processing method, and medium on which image processing program is recorded |
US20060263125A1 (en) * | 2005-05-20 | 2006-11-23 | Lexmark International, Inc. | Method for processing a duplexed document |
US20060263126A1 (en) * | 2005-05-20 | 2006-11-23 | Scott Heydinger | Method for Reducing Show-Through in a Scanned Duplexed Document |
US20110310151A1 (en) * | 2010-06-16 | 2011-12-22 | Canon Kabushiki Kaisha | Printing apparatus |
US20150192886A1 (en) * | 2014-01-07 | 2015-07-09 | Konica Minolta, Inc. | Damage amount determination device, image forming device, computer-readable recording medium storing damage amount determination program, and damage amount determination method |
Citations (7)
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US4456372A (en) * | 1981-06-19 | 1984-06-26 | Konishiroku Photo Industry Co., Ltd. | Copying machine equipped with a document detecting member |
US4721981A (en) * | 1986-11-03 | 1988-01-26 | Xerox Corporation | Low-cost document feeder for copiers |
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US5488464A (en) * | 1994-05-31 | 1996-01-30 | Xerox Corporation | Constant velocity transport for electronic document imaging |
-
1996
- 1996-11-18 US US08/751,893 patent/US5710957A/en not_active Expired - Fee Related
Patent Citations (7)
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US4456372A (en) * | 1981-06-19 | 1984-06-26 | Konishiroku Photo Industry Co., Ltd. | Copying machine equipped with a document detecting member |
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Non-Patent Citations (2)
Title |
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Patent Abstracts of Japan, vol. 11, NO. 42, p. 545, Feb. 6, 1987 and JP A 61212862, Sep. 20, 1986. * |
Patent Abstracts of Japan, vol. 11, NO. 42, p. 545, Feb. 6, 1987 and JP-A-61212862, Sep. 20, 1986. |
Cited By (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20060088208A1 (en) * | 1998-06-23 | 2006-04-27 | Sharp Kabushiki Kaisha | Image processing apparatus, image processing method, and medium on which image processing program is recorded |
US7158688B2 (en) * | 1998-06-23 | 2007-01-02 | Sharp Kabushiki Kaisha | Image processing apparatus, image processing method, and medium on which image processing program is recorded |
US6337958B1 (en) | 2000-09-05 | 2002-01-08 | International Business Machines Corporation | Matching the printing characteristics between two engines of a duplex print system |
US20060263125A1 (en) * | 2005-05-20 | 2006-11-23 | Lexmark International, Inc. | Method for processing a duplexed document |
US20060263126A1 (en) * | 2005-05-20 | 2006-11-23 | Scott Heydinger | Method for Reducing Show-Through in a Scanned Duplexed Document |
US7620359B2 (en) | 2005-05-20 | 2009-11-17 | Lexmark International, Inc. | Method for processing a duplexed document |
US7620360B2 (en) | 2005-05-20 | 2009-11-17 | Lexmark International, Inc. | Method for reducing show-through in a scanned duplexed document |
US20110310151A1 (en) * | 2010-06-16 | 2011-12-22 | Canon Kabushiki Kaisha | Printing apparatus |
US8382227B2 (en) * | 2010-06-16 | 2013-02-26 | Canon Kabushiki Kaisha | Printing apparatus for detecting and avoiding unprintable regions on recording mediums |
US20150192886A1 (en) * | 2014-01-07 | 2015-07-09 | Konica Minolta, Inc. | Damage amount determination device, image forming device, computer-readable recording medium storing damage amount determination program, and damage amount determination method |
US9568876B2 (en) * | 2014-01-07 | 2017-02-14 | Konica Minolta, Inc. | Damage amount determination device, image forming device, computer-readable recording medium storing damage amount determination program, and damage amount determination method |
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